By "music movie" I presume you mean a movie in which music is the central theme, not just it’s soundtrack? Crazy Heart, Coal Miner’s Daughter, Tender Mercies, The Rutles, Riot On Sunset Strip, Oh Brother Where Art Thou, The Wrecking Crew, George Harrison: Living In The Material World, Hail Hail Rock ’n’ Roll!, Standing In The Shadows Of Motown, Muscle Shoals, Tom Dowd & The Language Of Music, The Last Waltz of course, Don't Look Back and No Direction Home, and A Hard Day’s Night and Help!.